CN110253129A - The system and method for spot welding aluminum is used for based on high-frequency inversion direct current resistance welding power source - Google Patents
The system and method for spot welding aluminum is used for based on high-frequency inversion direct current resistance welding power source Download PDFInfo
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- CN110253129A CN110253129A CN201910650233.9A CN201910650233A CN110253129A CN 110253129 A CN110253129 A CN 110253129A CN 201910650233 A CN201910650233 A CN 201910650233A CN 110253129 A CN110253129 A CN 110253129A
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- 238000003466 welding Methods 0.000 title claims abstract description 121
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005476 soldering Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000033228 biological regulation Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000011217 control strategy Methods 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- QZLJNVMRJXHARQ-UHFFFAOYSA-N [Zr].[Cr].[Cu] Chemical compound [Zr].[Cr].[Cu] QZLJNVMRJXHARQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 10
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
Abstract
A kind of system and method being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source, it is characterised in that: including resistance welding power source, high frequency transformer, high frequency secondary rectifier unit, electrode unit, pressure monitor unit, voltage feedback unit, current feedback unit；The pressure monitor unit is connect with master control borad, realizes that the detection to pressure is fed back and control soldering turret servo motor pressurizes to workpiece according to setting pressure；The master control borad is connect with pressure monitor unit, voltage feedback unit, current feedback unit, realizes the acquisition to welding pressure, secondary voltage, secondary current.Reverse frequency is 10KHz, and 20000 groups of data points of acquisition per second may be implemented according to acquisition secondary current output waveform, improve the acquisition rate of system, control welding process that can be more accurate.
Description
Technical field
The present invention relates to electric resistance welding fields, and in particular to one kind is used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source
System and method.
Background technique
Demand of the today's society with people to environmental protection and energy-saving and emission-reduction improves, and automotive light weight technology reduces oil consumption as realization
With the most effective direct method of gas emissions, have become the trend of world car manufacture.Aluminium alloy is with its property outstanding
It can cut a conspicuous figure in lightweighting materials with advantage, be favored and be applied in the vehicle of part by numerous producers.Resistance spot welding is made
It is high-efficient with its reliable in quality for one of body of a motor car Joining Technology, economy and it is easy to be automated using robot
The features such as welding and be widely used.But since aluminium alloy itself has high conductivity, high thermal conductivity, fusing point is low, oxidizable
Etc. physicochemical characteristics, enable aluminum alloy to resistance spot welding compared to traditional steel point of resistance and be welded with larger difference, be mainly shown as
Short weld interval is needed, big welding current, high welding pressure etc., although having carried out phase to this from different directions both at home and abroad
Research is closed, but major part remains in laboratory stage, the spot welding aluminum technical effect into the practical stage is also ideal not to the utmost, main
Wanting problem to have, volume of transformer is big, and soldering turret proposes higher want due to bear the load structure design of very big pressure butt welding tongs
It asks, controller or source of welding current power are big, at high cost, and electrode dressing frequency is high, need dedicated electrode band or electrode structure etc..
Summary of the invention
In view of the above-mentioned problems, a kind of direct current resistance welding power source based on high-frequency inversion that the purpose of the present invention proposes carries out aluminium
Acquisition per second may be implemented according to acquisition secondary current output waveform in the method and system of spot welding, reverse frequency 10KHz
20000 groups of data points, improve the acquisition rate of system, control welding current that can be more accurate.
The technical proposal adopted by the invention to solve the above technical problems is that: one kind is based on high-frequency inversion direct current welding resistance electricity
The system that source is used for spot welding aluminum, it is characterised in that: including resistance welding power source, high frequency transformer, high frequency secondary rectifier unit, electrode
Unit, pressure monitor unit, voltage feedback unit, current feedback unit；The pressure monitor unit is connect with master control borad, is realized
Detection feedback and control soldering turret servo motor to pressure pressurize to workpiece according to setting pressure；The master control borad and pressure
Welding pressure, secondary voltage, secondary current are adopted in power monitoring unit, voltage feedback unit, current feedback unit connection, realization
Collection.
Further, the resistance welding power source includes master control borad, driving plate, power cell.
Further, the power cell includes primary rectifier module, filter capacitor, IGBT.
Further, the MCU model model STM32F103 on the master control borad is realized to secondary signal acquisition time
Accurate control.
Further, the upper/lower electrode of the electrode unit uses chromium-zirconium-copper material, and electrode diameter d1 is the electrode of 12-18mm
Cap, electrode end surface are the circular arc that radius R1 is greater than 40mm.
Further, the IGBT of the power cell 10 and high frequency secondary rectifier unit are adapted with high-frequency inversion frequency
High Frequency IGBT Module and high-frequency rectification module.
Further, the resistance welding power source is high-frequency inversion resistance welding power source, and driving plate is high-frequency I GBT driving plate, master control
Plate connect realization control driving plate with driving plate and carries out high-frequency switch control to IGBT, and reverse frequency reaches 10KHz.
Further, the high frequency transformer uses centre tap form, and iron core uses Ferrite Material；The current feedback
Unit covers the output end in the high frequency secondary rectifier unit using annular Rogowski coil.
A kind of direct current resistance welding power source progress spot welding aluminum method based on high-frequency inversion, it is characterised in that: including following step
Suddenly
(1) according to the secondary current curve of cyclical fluctuations, in a welding interval, welding current can pass through having for 2 welding currents
Valid value crosses electric current in the signal access master control borad interrupt pin at virtual value moment；
(2) output of the terminal juncture of virtual value to pressure monitor unit, voltage feedback unit, current feedback unit is being crossed
Signal is sampled；
(3) secondary resistance is calculated according to Ohm's law by the secondary voltage that acquires and secondary current, according to secondary resistance with
The difference adjustment output current resistor weighted value ε 1 that setting resistance curve compares；
(4) the difference adjustment output current stresses weighted value ε according to the second pressure data of acquisition compared with setting pressure
2；
(5) by resistance weighted value ε 1 multiplied by resistance regulation coefficientAlong with pressure weighted value ε 2 is adjusted multiplied by resistance
CoefficientAs a result, obtaining electric current regulation coefficient
(6) according to electric current regulation coefficientBy PID control strategy, by adjusting PWM composite wave on master control borad (8)
Shape is changed adjustment to control the pulse-width modulation PWM waveform of the output of driving plate 9, realizes the height to welding current output size
The accurate control of frequency.
The present invention has the advantages that
1, electric current adjustment frequency faster, adjusts finer
Secondary current output waveform is a pulsating waveform as shown in Fig. 2, the pulsation period is consistent with the inversion period, secondary
Grade electric current and voltage are acquired in pulsating waveform virtual value, from waveform it can be seen that each period can acquire 2 times, are being had
The valid value moment, which is acquired, to be guaranteed, the consistency at each data acquisition moment and accurate fixed, inversion intermediate-frequency welding machine acquisition frequency
Rate is limited to reverse frequency, usually 1KHz or 2KHz, using a kind of D.C. resistance based on high-frequency inversion proposed by the present invention
The method and system that power supply carries out spot welding aluminum is welded, reverse frequency 10KHz may be implemented according to acquisition secondary current output waveform
20000 groups of data points of acquisition per second, improve the acquisition rate of system, control welding current that can be more accurate.
2, transformer can be lighter smaller
According to the induced potential formula of transformer:In formula: E-- induced potential virtual value f-- frequency N-- circle
Number-- main flux maximum value；It is can analyze out according to formula in one timing of induced potential virtual value, when frequency is high, the number of turns,
Main flux can lack, and certain iron core also can be small, and natural volume of transformer can do small, and weight can also reduce.By
This is as it can be seen that transformer can be than common inversion intermediate-frequency welding machine volume under identical capacity in the electric resistance welding system based on high-frequency direct-current
Smaller, weight is lighter, is more suitable robot welding.
3, welding current is smaller, and source of welding current volume is smaller, and welding pressure is smaller
Aluminium alloy thermal coefficient is high, specific heat capacity is big, and existing aluminium alloy pinpoint welding technique is by high current, big pressure come real
Existing, electric current generally requires 40~100KA, and thus to the control of resistance welding power source and cooling, more stringent requirements are proposed, needs
Using powerful rectification and IGBT module, cause Control System Design with high costs, volume is also bigger, proposes using the present invention
Method, welding current be 35KA, pressure be 4-6KN under conditions of good welds can be realized, effectively reduce electric resistance welding
The power and volume of power supply, reduce the payload of soldering turret, simplify soldering turret design.
4, spot welding aluminum can be realized with conventional shape electrode and can reduce electrode dressing frequency
With the copper alloy of copper electrode electrochemical reaction can occur for the metal after aluminium alloy rapid heat dissipation and aluminum alloy piping welding are melted,
Lead to electrode adhesion, influence welding quality, usual 40-70 point just needs to carry out a reconditioning；Furthermore Al-alloy metal surface holds
Oxidation film is easily formed, the oxidation film resistivity is big, fusing point is high, therefore aluminium alloy pinpoint welding technique has relatively high want to welding electrode
It asks, a kind of method and system of the direct current resistance welding power source progress spot welding aluminum based on high-frequency inversion proposed by the present invention, the system
Electrode tip output be high frequency pulsating direct current, a kind of arteries and veins of cone can be formed on oxides by the high-frequency current
Beam is rushed, which can remove the oxidation film of aluminum alloy surface with quick and stable mode, and preferentially in work piece interface
Area of energy concentration is formed, forms nugget, therefore electrode end surface uses common end face flat electrodes cap, and electrode can be improved
The number interval of reconditioning.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
The direct current resistance welding power source spot welding aluminum system block diagram of Fig. 1 high-frequency inversion
Fig. 2 inversion direct current electric resistance welding power supply secondary current waveform diagram
The direct current resistance welding power source of Fig. 3 high-frequency inversion carries out the method flow diagram of spot welding aluminum
Fig. 4 electrode sections figure
Wherein: resistance welding power source 1, high frequency transformer 2, high frequency secondary rectifier unit 3, electrode unit 4, pressure monitor unit
5, voltage feedback unit 6, current feedback unit 7；Wherein resistance welding power source 1 includes master control borad 8, driving plate 9, power cell 10
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
A kind of system being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source, which includes resistance welding power source 1,
High frequency transformer 2, high frequency secondary rectifier unit 3, electrode unit 4, pressure monitor unit 5, voltage feedback unit 6, current feedback
Unit 7；Wherein resistance welding power source 1 includes master control borad 8, driving plate 9, power cell 10；Power cell 10 includes primary rectifier mould
The devices such as block, filter capacitor, IGBT；The pressure monitor unit is connect with master control borad, realize to the detection of pressure feedback and
Control soldering turret servo motor pressurizes to workpiece according to setting pressure；The master control borad and pressure monitor unit, Voltage Feedback
Unit, current feedback unit connection, realize the acquisition to welding pressure, secondary voltage, secondary current.
The resistance welding power source 1 be high-frequency inversion resistance welding power source, driving plate 9 be high-frequency I GBT driving plate, master control borad 8 with
The connection of driving plate 9 realizes that control driving plate 9 carries out high-frequency switch control to IGBT, and reverse frequency reaches 10KHz；The system
Work in inversion high-frequency section, therefore high frequency transformer 2, design that high frequency secondary rectifier unit 3 is carried out both for high band and
Type selecting；
The master control borad 8 and pressure monitor unit 5, voltage feedback unit 6, current feedback unit 7 connect, and realize to welding
The acquisition of pressure, secondary voltage, secondary current, sample frequency are 2 times of high-frequency inversion frequency, such as when reverse frequency is 10KHz
When it is per second acquire 20000 data points, to realize the control that more refines to welding process.
The IGBT and high frequency secondary rectifier unit 3 of the power cell 10 are the high frequencies being adapted with high-frequency inversion frequency
IGBT module and high-frequency rectification module；
The high frequency transformer 2 uses centre tap form, and as shown in Fig. 1 secondary electrical depressor 2, iron core uses ferrite material
Material；The current feedback unit 7 is covered the output end in the high frequency secondary rectifier unit 3, that is, is exported using annular Rogowski coil
The positive or negative pole end in circuit；
Mainboard version 8 controls driving plate 9 and carries out switch control, inversion frequency to IGBT component by output pulse width modulation (PWM) wave
The rate not instead of intermediate frequency of 1KHz is in inversion high-frequency section, can achieve 10KHz；
Further, MCU model STM32F103 on the master control borad realizes the accurate control to secondary signal acquisition time
System.
Further, the upper/lower electrode of the electrode unit uses chromium-zirconium-copper material, and electrode diameter d1 is the electrode of 12-18mm
Cap, electrode end surface are the circular arc that radius R1 is greater than 40mm.
Further, the IGBT of the power cell 10 and high frequency secondary rectifier unit are adapted with high-frequency inversion frequency
High Frequency IGBT Module and high-frequency rectification module.
Further, the resistance welding power source is high-frequency inversion resistance welding power source, and driving plate is high-frequency I GBT driving plate, master control
Plate connect realization control driving plate with driving plate and carries out high-frequency switch control to IGBT, and reverse frequency reaches 10KHz.
Further, the high frequency transformer uses centre tap form, and iron core uses Ferrite Material；The current feedback
Unit covers the output end in the high frequency secondary rectifier unit using annular Rogowski coil.
A kind of direct current resistance welding power source progress spot welding aluminum method based on high-frequency inversion,
1, the secondary current curve of cyclical fluctuations according to fig. 2, in a welding interval, welding current can pass through 2 welding currents
Virtual value crosses electric current in the signal access master control borad MCU interruption pin at virtual value moment, and MCU model STM32F103 is real
Now to the accurate control of secondary signal acquisition time；
2, cross virtual value terminal juncture to pressure monitor unit 5, voltage feedback unit 6, current feedback unit 7 it is defeated
Signal is sampled out, such as t1, t2, t3, t4, t5, t6, t7, t8, t9, and the moment such as t10, sample frequency can achieve 20KHz,
That is 20000 groups of data points of acquisition per second；
3, secondary resistance is calculated according to Ohm's law by the secondary voltage that acquires and secondary current, according to secondary resistance with set
Determine the difference adjustment output current resistor weighted value ε 1 that resistance curve compares；
4, the difference adjustment output current stresses weighted value ε 2 according to the second pressure data of acquisition compared with setting pressure；
5, by resistance weighted value ε 1 multiplied by resistance regulation coefficientIt is along with pressure weighted value ε 2 is adjusted multiplied by resistance
NumberAs a result, obtaining electric current regulation coefficient
6, according to electric current regulation coefficientBy PID control strategy, on master control borad 8 by adjust PWM combined waveform from
And the pulse-width modulation PWM waveform of the output of driving plate 9 is controlled, realization accurately controls the high frequency of welding current output size, PID tune
Section frequency can achieve 10KHz；
Quality of welding spot is influenced during electric resistance welding, and mainly there are three factors, are welding current, weld interval, pressure respectively
Power, current each company are mainly the output control for carrying out monitoring to these three parameters and carrying out resistance spot welding according to respective algorithm
System, the reverse frequency of inversion intermediate frequency direct current resistance welder is substantially to be fixed using some in the range of 800-1200Hz
Value carries out inversion welding, wherein the reverse frequency with 1KHz is most widely used.
The present invention proposes that a kind of direct current resistance welding power source based on high-frequency inversion carries out the method and system of spot welding aluminum, this is
System works in inversion high-frequency section, therefore high frequency transformer 2, the design that high frequency secondary rectifier unit 3 is carried out both for high band
And type selecting.
The course of work
After welding starts, master control borad transfers corresponding welding variables according to input signal, according to setting welding parameter
It is welded, reverse frequency 10KHz, parameter mainly includes each section of welding current, weld interval, and pressure relevant to pressure
Power numerical value and pressure time etc., such as squeeze time, pressing time, pressure hold time etc..
In squeeze time and master control borad 9 passes through the control soldering turret servo motor of pressure monitor unit 5 to workpiece in pressing time
It is clamped and applies setting pressure；
After welding starts, acquisition electric current cross interruption moment of virtual value to pressure monitor unit 5, voltage feedback unit 6,
Current feedback unit 7 carries out data acquisition, and since inversion has reached 10KHz, sample rate can achieve the high-frequency data of 20KHz
Acquisition；
According to Ohm's law, the data operation acquired in real time to voltage feedback unit 6, current feedback unit 7 obtains secondary
Resistance value, and it is compared acquisition deviation with the resistance curve of setting, output current resistor weighted value ε is adjusted according to deviation
1；
According to the data of the pressure monitor unit 5 acquired in real time, by the acquisition deviation compared with setting pressure, according to inclined
Difference adjustment output current stresses weighted value ε 2；
By resistance weighted value ε 1 multiplied by resistance regulation coefficientAlong with by pressure weighted value ε 2 multiplied by resistance regulation coefficientAs a result, obtaining electric current regulation coefficient
According to electric current regulation coefficientBy PID control strategy, on master control borad 8 by adjust PWM combined waveform to
The pulse-width modulation PWM waveform that driving plate 9 exports is controlled, realization accurately controls the high frequency of welding current output size, and PID is adjusted
Frequency can achieve 10KHz；
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (9)
1. a kind of system for being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source, it is characterised in that: including electric resistance welding electricity
Source (1), high frequency transformer (2), high frequency secondary rectifier unit (3), electrode unit (4), pressure monitor unit (5), Voltage Feedback
Unit (6), current feedback unit (7)；The pressure monitor unit (5) connect with master control borad (8), realizes anti-to the detection of pressure
Feedback and control soldering turret servo motor pressurize to workpiece according to setting pressure；The master control borad (8) and pressure monitor unit
(5), welding pressure, secondary voltage, secondary current are adopted in voltage feedback unit (6), current feedback unit (7) connection, realization
Collection.
2. a kind of system for being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source according to claim 1, special
Sign is: the resistance welding power source (1) includes master control borad (8), driving plate (9), power cell (10).
3. a kind of system for being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source according to claim 2, special
Sign is: the power cell (10) includes primary rectifier module, filter capacitor, IGBT.
4. a kind of system for being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source according to claim 1, special
Sign is: the MCU model STM32F103 on the master control borad (8), realizes the accurate control to secondary signal acquisition time.
5. a kind of system for being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source according to claim 1, special
Sign is: the upper/lower electrode of the electrode unit (4) uses chromium-zirconium-copper material, and electrode diameter d1 is the electrode cap of 12-18mm, electricity
Extreme face is the circular arc that radius R1 is greater than 40mm.
6. a kind of system for being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source according to claim 3, special
Sign is: the IGBT and high frequency secondary rectifier unit (3) of the power cell 10 are the high frequencies being adapted with high-frequency inversion frequency
IGBT module and high-frequency rectification module.
7. a kind of system for being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source according to claim 3, special
Sign is: the resistance welding power source (1) is high-frequency inversion resistance welding power source, and driving plate (9) is high-frequency I GBT driving plate, master control borad
(8) it connect realization control driving plate (9) with driving plate (9), high-frequency switch control is carried out to IGBT, reverse frequency reaches
10KHz。
8. a kind of system for being used for spot welding aluminum based on high-frequency inversion direct current resistance welding power source according to claim 3, special
Sign is: the high frequency transformer (2) uses centre tap form, and iron core uses Ferrite Material；The current feedback unit
(7) using annular Rogowski coil, the output end in the high frequency secondary rectifier unit (3) is covered.
9. a kind of use as described in claim 1-8 any one based on high-frequency inversion direct current resistance welding power source for spot welding aluminum
The method of system progress spot welding, it is characterised in that: include the following steps
(1) according to the secondary current curve of cyclical fluctuations, in a welding interval, welding current can pass through the virtual value of 2 welding currents,
Electric current is crossed in signal access master control borad (8) interrupt pin at virtual value moment；
(2) terminal juncture of virtual value is being crossed to pressure monitor unit (5), voltage feedback unit (6), current feedback unit (7)
Output signal sampled；
(3) secondary resistance is calculated according to Ohm's law by the secondary voltage and secondary current that acquire, according to secondary resistance and setting
The difference adjustment output current resistor weighted value ε 1 that resistance curve compares；
(4) the difference adjustment output current stresses weighted value ε 2 according to the second pressure data of acquisition compared with setting pressure；
(5) by resistance weighted value ε 1 multiplied by resistance regulation coefficientAlong with by pressure weighted value ε 2 multiplied by resistance regulation coefficientAs a result, obtaining electric current regulation coefficient
(6) according to electric current regulation coefficientBy PID control strategy, on master control borad (8) by adjust PWM combined waveform from
And the pulse-width modulation PWM waveform of the output of driving plate 9 is controlled, realization accurately controls the high frequency of welding current output size.
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| CN201910650233.9A CN110253129B (en) | 2019-07-18 | 2019-07-18 | System and method for aluminum spot welding based on high-frequency inversion direct-current resistance welding power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992865A (en) * | 2020-08-21 | 2020-11-27 | 天津七所高科技有限公司 | Fault detection circuit and method for secondary rectifier module of inverter resistance welding |
| CN114798732A (en) * | 2022-06-30 | 2022-07-29 | 太原理工大学 | Method for regulating interface structure of bimetal laminated composite plate by multi-frequency composite current |
| CN115026398A (en) * | 2021-06-30 | 2022-09-09 | 天津七所高科技有限公司 | Dynamic preheating welding method for aluminum alloy spot welding |
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| CN114798732B (en) * | 2022-06-30 | 2022-10-21 | 太原理工大学 | Method for regulating interface structure of bimetal laminated composite plate by multi-frequency composite current |
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